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81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
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/*
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* \brief File-descriptor allocator implementation
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* \author Christian Prochaska
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* \author Norman Feske
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* \date 2010-01-21
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*/
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/*
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* Copyright (C) 2010-2011 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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/* Genode includes */
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#include <base/env.h>
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#include <base/printf.h>
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/* libc plugin interface */
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#include <libc-plugin/fd_alloc.h>
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namespace Libc {
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File_descriptor_allocator *file_descriptor_allocator()
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{
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static File_descriptor_allocator _file_descriptor_allocator;
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return &_file_descriptor_allocator;
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}
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}
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using namespace Libc;
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using namespace Genode;
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File_descriptor_allocator::File_descriptor_allocator()
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: Allocator_avl_tpl<File_descriptor>(Genode::env()->heap())
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{
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add_range(0, MAX_NUM_FDS);
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}
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File_descriptor *File_descriptor_allocator::alloc(Plugin *plugin, Plugin_context *context, int libc_fd)
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{
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enum { ANY_FD = -1 };
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/* we use addresses returned by the allocator as file descriptors */
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addr_t addr = (libc_fd == ANY_FD ? ANY_FD : libc_fd);
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/* allocate fresh fd if the default value for 'libc_fd' was specified */
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bool alloc_ok = false;
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if (addr == ANY_FD)
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alloc_ok = Allocator_avl_base::alloc(1, reinterpret_cast<void**>(&addr));
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else
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alloc_ok = (Allocator_avl_base::alloc_addr(1, addr) == ALLOC_OK);
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if (!alloc_ok) {
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PERR("could not allocate libc_fd %d%s",
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libc_fd, libc_fd == ANY_FD ? " (any)" : "");
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return 0;
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}
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File_descriptor *fdo = metadata((void*)addr);
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fdo->libc_fd = (int)addr;
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fdo->plugin = plugin;
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fdo->context = context;
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return fdo;
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}
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void File_descriptor_allocator::free(File_descriptor *fdo)
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{
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Allocator_avl_base::free(reinterpret_cast<void*>(fdo->libc_fd));
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}
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File_descriptor *File_descriptor_allocator::find_by_libc_fd(int libc_fd)
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{
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return metadata(reinterpret_cast<void*>(libc_fd));
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}
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